# How far will Eagle Eye let me see on the open ocean?

How far will Eagle Eye let me see on the open ocean?

Eagle eye creates a magical sensor directly above you. The sensor can appear anywhere above you, to a maximum height equal to the spell's range.

It is a long range spell. Obviously this is a long long way, but the spell doesn't specify how far away I can see. Obviously in many situations it'd limited by obstructions, but this spell should really shine on the open sea. How far can I see with Eagle Eye at it's maximum height on the open ocean?

-
The only limit to this spell on the open ocean is the limit of your visual acuity, as the spell description states: "You can see from this vantage as if you were actually there, rotating your viewpoint 360 degrees. You perceive with your normal visual senses." So to determine the level of detail you see or anything unusual you might notice would come down to Perception despite the phenomenal field of view. :) – Tyri Oct 10 '12 at 15:37

The maximum height would be 1200 feet (400 + 800 for level).

I assume you could see out to the horizon on the open sea.

For an earth-like world, distance to the horizon is approximately 46.26 miles at that height.

Expanded details:

If this were a druid caster:

• At level 3, the height would be 520 for a distance of 27.82 miles. (Minimum caster level)
• At level 5, the height would be 640 for a distance of 30.86 miles.
• At level 10, the height would be 800 for a distance of 34.51 miles.
• At level 15, the height would be 1000 for a distance of 38.58 miles.
• At level 20, the height would be 1200 for a distance of 46.26 miles.
-

Note that the spell gives you a high vantage point, it does NOT give you any sensory improvement, though.

Getting up that high gives you a very far horizon but that doesn't mean you'll actually SEE things that far away unless they are VERY big.

-
This is a comment, not an answer, since the question is about the mere distance. – SevenSidedDie Sep 21 '12 at 17:42
@ioanwigmore Actually, this really only belongs as a comment on the question. – SevenSidedDie Sep 21 '12 at 23:28
@LorenPechtel It's not. It's asking how far one can see, not how far one can see [insert object here]. Everyone else answering and voting understood the question being about distance, not eye-resolution or somesuch, so you're in the minority in interpreting the question as you have. Furthermore, your "answer" doesn't bother to answer the question – it's just lecturing that it's a bad Q. If you insist this question is about how far away you can see specific objects, why not answer that question? As it stands, you're not answering anything at all. If you must give a caveat, make it a comment. – SevenSidedDie Sep 22 '12 at 19:29
Loren, can you add some more detail to this answer? For example, give us sample ideas of what "very big" means for various heights? – Brian Ballsun-Stanton Sep 23 '12 at 11:36

Horizon on Earth distance is:

d=1.22√(h)
d = distance in miles
h = height in feet.

More than you care to know about the issue is on Wikipedia's Horizon entry

-

The answer by MadMAxJr is a really good description of how the size of the field of vision increases in an area with no obstructions (ie: on the open ocean).

I think the other part of the OP's question is, given a perfectly clear field, how far can you actually see in detail.

This would be a matter of perception, since in the spell description it specifically states, "You can see from this vantage as if you were actually there, rotating your viewpoint 360 degrees. You perceive with your normal visual senses."

So, depending on ambient light and atmospheric conditions (humidity, etc), there will be positive or negative DC modifiers... Including a +1/10ft DC modifier for distance. How far you can see is limited only by your perception.

-
So, while I'll freely admit that I think DC +1/10ft is crude and unweildy, it's what is in the book. This translates to a DC +528 at one mile (5280 feet). Of course other modifiers come in to play, like size, color (camouflage -vs- contrast), movement, atmospheric conditions (clear -vs- haze) etc. So you'd see land (very low DC) LONG before a creature on the shore. The final DC is in the GM's hands. The character's perception bonus, even with a Take 20 -vs- the DC still doesn't allow you to SEE to the limits of the spell field of vision. – Tyri Sep 26 '12 at 13:24